GM None Pontiac Aztek - Manual (Page 290)

Weight of the Trailer Tongue
The tongue load (A) of any trailer is an important weight
to measure because it affects the total or gross weight
of your vehicle. The Gross Vehicle Weight (GVW)
includes the curb weight of the vehicle, any cargo you
may carry in it, and the people who will be riding in
the vehicle. If you have a lot of options, passengers, or
cargo in the vehicle, it will reduce the tongue weight
your vehicle can carry, which will also reduce the trailer
weight your vehicle can tow. And if you will tow a
trailer, you must add the tongue load to the GVW
because your vehicle will be carrying that weight, too.
See Loading Your Vehicle on page 4-36 for more
information about your vehicle’s maximum load capacity.
If you are using a weight-carrying or a weight-distributing
hitch, the trailer tongue weight (A) should be 10 percent
to 15 percent of the total loaded trailer weight (B).
Do not exceed the maximum allowable tongue weight
for your vehicle.
After you have loaded your trailer, weigh the trailer and
then the tongue, separately, to see if the weights are
proper. If they are not, you may be able to get them right
simply by moving some items around in the trailer.
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